One Unresolved Issue in the Study of Optimism That Complicates

One unresolved issue in the study of optimism that complicates the interpretation of the connection between optimism and well-being outcomes concerns the meaning and measure of optimism. Are optimism and pessimism two ends of a single continuum or two independent dimensions? This issue is about whether

A) it is the presence of optimism or the absence of pessimism that is the most important predictor of well-being.
B) optimism is always good and pessimism always bad for well-being.
C) optimism enhances emotional well-being, but damages physical well-being.
D) how much optimism is "too much."